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Pin No.
Label
Pin Definition
Grove Sensor Interfaces
The RAK1920 module supports the Grove I2C and digital I/O sensors. Figure 4 shows the pin number and
definition of the Grove sensor. By default, VCC is connected to the 3.3 V line of the IO connector.
Figure 4: Grove Sensor interfaces
By default, the I2C is enabled in the RAK1920 module, but if it is required, the RAK1920 module can also support
sensors with Grove UART interface and ADC sensors. To enable the UART interface, a resistance connection
needs to be added by the customer. When using the Grove UART interface sensor module, replace R9 to R10 and
R11 to R12. When using Grove ADC interface (not ADC to I2C module) sensor module, replace R13 to R14 and
change R15 to R16.
6
SPI_MOSI
SPI Master Output Slave Input
7
+3.3 V
VCC 3.3 V Power
8
GND
Reference Ground
9
GND
Reference Ground
10
+5 V
VCC 5.5 V Power
11
I2C_SDA
I2C Data
12
I2C_SCL
I2C Clock
13
UART_TX
UART Transmit
14
UART_RX
UART Receive
15
INT
Hardware Interrupt
16
PWM
PWM Input